Stepping the system clock during boot

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FreeBSD allows you to perform an instantaneous change to your system clock while the host is booting up no matter how great the difference between a machine’s current clock setting and the correct time.

Use the sysrc command as root to append ntpdate_enable and ntpdate_hosts to /etc/rc.conf

$ sysrc ntpdate_enable=YES
ntpdate_enable: NO -> YES
$ sysrc
ntpdate_hosts:  ->

Finally, to verify that everything worked correctly

$ grep ntpdate /etc/rc.conf


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